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A 350cfm fan is plenty for your 4x4x6 tent. Fan should be able to exchange the air in your space about every 3 minutes. The exhaust port will need to fit your fan or you'll need some reducers to go from 4" or 6" to 8". Can't advise on fan/charcoal source in China. Free shipping is pretty easy to find here. 5 plants in that tent is gonna be wicked tight and they're going to end up shading each other especially if you're gonna LST. Do what oldjarhead100 advices and use rubber bungee to eliminate the noise and vibration. Works like a charm.
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